If you haven’t played it yet I highly recommend checking it out! It’s a mod for Portal 2 that you can download directly via Steam. It serves up more Portal related brain teasers with a catch, you have a portable time machine!
The time machine has three buttons: Start, Stop and Play. You can record yourself standing on or pressing buttons, picking up items to hand to yourself, firing portals or even crouching to help your current self get up walls.
The mod campaign is pretty short, although there is a workshop with more levels if you feel like punishing your brain into overdrive. I finished it in about three hours playing on and off, and most of that was through trial and error as the puzzles started to become more advanced. It’s definitely worth checking out if you want another portal related adventure… with a twist!